Corrosion Protection in Chloride Environments of Nanosilica Containing Epoxy Powder Coatings with Defects

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dc.contributor.author Fernández Álvarez, María
dc.contributor.author Velasco López, Francisco Javier
dc.contributor.author Bautista Arija, María Asunción
dc.contributor.author González-García, Yaiza
dc.contributor.author Galiana Blanco, Beatriz
dc.date.accessioned 2021-03-24T11:53:21Z
dc.date.available 2021-03-24T11:53:21Z
dc.date.issued 2020-12
dc.identifier.bibliographicCitation Fernández-Álvarez, M., Velasco, F., Bautista, A., Gonzalez-Garcia, Y. & Galiana, B. (2020). Corrosion Protection in Chloride Environments of Nanosilica Containing Epoxy Powder Coatings with Defects. Journal of The Electrochemical Society, 167(16), 161507.
dc.identifier.issn 0013-4651
dc.identifier.uri http://hdl.handle.net/10016/32214
dc.description.abstract This paper describes the use of innovative, nanosilica containing epoxy powder coatings for the corrosion protection of steel. Two types of nanosilica particles (hydrophilic -HL- and hydrophobic -HB-) were mixed by ball milling with the powders (0.75 wt.%). The adequate homogeneity and embedding of nanoparticles were verified by transmission electron microscopy. The corrosion performance of the coatings as-received, and with HL and HB additions, were analyzed in 3.5 wt.% NaCl solutions. The mechanism and rate of delamination of defective coatings under drops simulating atmospheric conditions were analyzed by Scanning Kelvin Probe measurements for 30 d. The results show that the corrosion attack progresses through a cathodic delamination mechanism. Besides, fully-immersed samples, with and without defects, were monitored by electrochemical impedance spectroscopy. In defective coatings under these conditions, the occurrence of anodic undermining is proved. The results obtained reveal that the corrosion driven coating failure is delayed in the case of the epoxy coatings containing nanosilica. This delay is larger in the case of HB additions than HL additions in both atmospheric and immersion conditions. The corrosion mechanism observed is dependent upon exposure conditions. It is proposed that the nanoparticles delay water absorption, thus delaying corrosion attack.
dc.description.sponsorship This work was supported by Interreg SUDOE, through the KrEaTive Habitat project (grant number SOE1/P1/E0307) and the Spanish Ministry of Science, Innovation and Universities (MICINN) through the project RTI2018-101020-B-100.
dc.language.iso eng
dc.publisher IOP Science
dc.rights © IOP Publishing, 2020
dc.title Corrosion Protection in Chloride Environments of Nanosilica Containing Epoxy Powder Coatings with Defects
dc.type article
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1149/1945-7111/abd003
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. RTI2018-101020-B-100
dc.type.version acceptedVersion
dc.identifier.publicationissue 16
dc.identifier.publicationtitle Journal of The Electrochemical Society
dc.identifier.publicationvolume 167
dc.identifier.uxxi AR/0000026741
dc.contributor.funder Ministerio de Ciencia, Innovación y Universidades (España)
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